I am planning a few days travel around Spain in Jan/Feb and looking at routes and reservations. I have seen plenty of information about how to book reservation etc, but am struggling to find which trains do NOT need reservations! This is even trickier as I know the planner timetable is not fully accurate for Spain!
Can anyone advise which trains / routes in Spain can be taken without making any reservation? I am particularly interesting in the South, but be good to see all options!